The prevalence by state or territory of usual residence varied slightly, ranging from 0.21% in South Australia to 0.42% in Tasmania.

Almost three quarters of people with autism in the SDAC were aged 5-18 years - the age at which they are attending school. With 13,300 people with autism in this age bracket in New South Wales, 14,300 in Victoria, 9,700 in Queensland, 4,400 in Western Australia and another 5,400 across the remaining states and territories, there is a large number of people with autism who will be leaving the school environment in the next 10 years, many of whom will need assistance to transition into their post-school life.

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